What are some alternatives?
When comparing ApPHP Calendar and Ops Calender, you can also consider the following products
Teamweek - A project management software to help you get the best overview. Plan fast, change plans faster!
CalendarAnything - CalendarAnything offers a customizable and easy to use calender tool for Salesforce.
Apple Mail - There’s big news attached.
Time.ly - Time.ly is a collaborative calendar solution for websites.
Time Slot Booking Calendar PHP - Time Slots Booking Calendar PHP for online appointment booking and class scheduling.
Teamup Calendar - Cloud-based calendaring using capability URL, application developed in Zurich, Switzerland.